3. YouTube

4. Instagram

5. Skype

6. WhatsApp

7. Find My iPhone

Apple

Released: June 2010

8. Google Maps

Google

Released: December 2012

9. Twitter

Twitter

Released: October 2009

10. iTunes U

Apple

Released: 2010

Some other fun statistics

Sean Gallup / Getty Images

- Pandora has the top-grossing app of all time thanks to its ad-based and in-app subscription model.- Apple's Pages word processor is the only app that made the top 10 money-making apps list with paid downloads (it used to cost $9.99 before Apple made it free.) Every other app, like Spotify, made money off of ads or in-app purchases.- Skype is the only app in the history of the App Store to appear in both the top 10 downloads and revenue list.- "Clash of Clans" and "Candy Crush Saga" are the two most profitable App Store games. "Candy Crush" players spent a whopping $1.3 billioncollectively on in-app purchases last year.